"I'll remain in the same office by 2027," the Prime Minister remarked, noting that if the conversation was successful, he might welcome the interviewer into Number 10 for a follow-up conversation in 2026.
For a PM, there's never truly break for leaders. Shortly before we sat down, Sir Keir had been speaking with Ukrainian President Volodymyr Zelensky and attempting to understand what on earth had happened in Venezuela, where his big political chum, US President Donald Trump, had recently attacked and captured its leader, Nicolás Maduro.
When our lengthy talk, which was much longer than usual, had concluded, Maduro had been indicted in New York.
As the year commences, Starmer appears to have had a degree of a refresh. Maybe even just a bit of relaxation with loved ones at Chequers, the prime minister's country retreat.
That certainly seemed to have left him in a more positive mood than at the sluggish end of 2025, a awful year politically for him.
Yet, are he and his supporters kidding themselves if they believe his political fate are poised to turn around?
The uncomfortable truth for the prime minister is that a significant number of his party members believe he's ineffective at his job. Some of them would sooner gamble and get him out in 2026.
However Sir Keir was dismissing such talk in the interview on Saturday morning.
Multiple times he told me he'd be "judged at the poll", insisting no one would remove his five-year mandate from him – even if the best chance of stopping Nigel Farage and Reform UK getting to No 10 could be for Labour to replace leader.
"This is the struggle of our times and I intend to guide the party," he declared.
The issue for the PM is that he will be scrutinised far sooner than then – in a huge set of elections in May throughout the UK. He tried to protest, maybe too much, that they are about who runs local authorities, and who runs the governments in Holyrood or Cardiff – and not about Westminster.
Accurate – to some extent. But even though he may not want to acknowledge it, No 10 will be evaluated by those elections too.
Despite this, Sir Keir implying that there were no situation under which he would step down, even if one of his colleagues contested his leadership for the job, if those elections prove catastrophic for Labour.
He attempted to explain his unpopularity by saying the public was naturally eager for things to improve. He aimed to convince me, and the nation, that the coming months would be distinct.
The economic situation would strengthen notwithstanding rising unemployment, he said, when strategies the government enacted during their initial choppy year began to take effect.
His central message is that soon the country will "see an improvement".
The prime minister may have spoken with greater vigour than I've seen from him for a some time – calmer, maybe, with a longer slot to talk.
But despite encountering pressure from many directions for a bolder strategy, with increased political clarity, more dynamism, more pace and more urgency, his arguments were well-known ones.
Given that he is in this much political trouble, is a different approach required a different script?
No administration, and especially not one that has been struggling in the polls for an extended period, has everything its as planned.
Sir Keir's challenges are not only because government is difficult, but because he and his colleagues have made mistakes, including in the last few weeks.
The PM admitted that he regretted saying he was "pleased" to see the return of the Egyptian-British activist Alaa Abd El Fattah to the UK after an backlash when comments he'd made in the past – such as calls for Zionists and police to be killed – surfaced.
Sir Keir attributed it to "the system" for not catching what the activist had said before – a more diplomatic way of saying it wasn't his responsibility.
And he is inviting clear political perils as the year progresses. His close relationship with the US president entails a new complication after Trump's military action on Venezuela.
Based on years of interviewing Sir Keir Starmer, a former human rights lawyer who was against the war in Iraq, over his career, the thought he would be content with this kind of intervention seems implausible.
He asserted he was a "longtime champion of international law" but the public "simply lack the entire story at the moment".
Opponents called for him to denounce it before the interview. And the administration is likely to face increased demands to give an clear view in Parliament in the near future.
And there has consistently been bubbling desire in the Labour ranks to undo or remake some of the results of Brexit.
Sir Keir disputes he's heading in that direction, but his new specific plan to align more closely with the EU's single market – the vast economic European trading zone – will likely elicit protests that he is breaking his vow never to try to undo the choices that flowed from Brexit.
A commitment to align with more of the single market will please many on his backbenches, but it is easy fodder for Reform and the Conservatives to
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